so, that's the table I have.I'm trying to calculate the standard deviation and variance for it.I tried doing this in code:a<-0:100b<-100:200c<-200:300d<-300:800sd(rep(c(a,b,c,d), times=c(90,140,150,120)))

But it says "invalid 'times' argument".So I don't really know what to do XD